Circuit/System Testing
- Test the fuel system for 345-414 kPa (50-60 psi). Refer to Fuel Pressure Gage Installation and Removal
.
- If the fuel pressure is not within the specified range, refer to Fuel System Diagnosis .
- Remove the high pressure fuel pump assembly and visually inspect the lobes on the camshaft for unusual wear.
- If the lobes appear normal, replace the high pressure fuel pump assembly.
- If the lobes are worn, replace the camshaft.
NOTE:
Circuit/System Verification must be performed first or misdiagnosis may result.
NOTE:
As little as 2 Ω of resistance on either circuit of fuel pressure regulator (FRP) solenoid will cause these DTCs to set. Test the circuits of the FRP solenoid for a high resistance if you suspect a condition.